A run-time error occurs when Array.Sort is called: XClass does not implement the IComparable interface.

   

using System;

public class Starter {
    public static void Main() {
        XClass[] objs ={new XClass(5), new XClass(10),
                new XClass(1)};
        Array.Sort(objs);
    }
}

public class XClass {
    public XClass(int data) {
        propNumber = data;
    }

    private int propNumber;
    public int Number {
        get {
            return propNumber;
        }
    }
}

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A run-time error occurs when Array.Sort is called: XClass does not implement the IComparable interface. : Array « Collections Data Structure « C# / C Sharp

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